A G.E.C.K. had been irradiated, and thus, the "Garden of Eden" it created was full of mutant plants and fungi. The mutant garden began to spread fairly rapidly, preying upon animal life and using them as carriers/fertilizer to spread its fungal seed. While it had accelerated regrowth and nature reclaiming the wasteland, the fact it was irradiated meant it also began to wipe out humans. The Midwestern Brotherhood of Steel had also gained a foothold in Florida. Mutant crocodiles were some of the forms of regional wildlife.